2120001211221 has 32 divisors (see below), whose sum is σ = 2975516590080. Its totient is φ = 1341183686976.

The previous prime is 2120001211061. The next prime is 2120001211267. The reversal of 2120001211221 is 1221121000212.

It is not a de Polignac number, because 2120001211221 - 2²¹ = 2119999114069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120001211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120001211621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442741 + ... + 2106186.

It is an arithmetic number, because the mean of its divisors is an integer number (92984893440).

Almost surely, 2^{2120001211221} is an apocalyptic number.

It is an amenable number.

2120001211221 is a deficient number, since it is larger than the sum of its proper divisors (855515378859).

2120001211221 is a wasteful number, since it uses less digits than its factorization.

2120001211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549153.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2120001211221 its reverse (1221121000212), we get a palindrome (3341122211433).

The spelling of 2120001211221 in words is "two trillion, one hundred twenty billion, one million, two hundred eleven thousand, two hundred twenty-one".